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<H1>IBM Visualization Data Explorer Programmer&#39;s Reference</H1>
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<H3><A NAME="HDRDXGAD" HREF="progu097.htm#PToC_248">DXGetArrayData</A></H3>
<A NAME="IDX1687"></A>
<A NAME="IDX1688"></A>
<P><STRONG>Function</STRONG>
<P>
Returns a pointer to the start of a global memory area containing the
items constituting
the data stored in an Array.
<P><STRONG>Syntax</STRONG>
<BR>
<TT><STRONG><BR>
&#35;include &lt;dx/dx.h&gt;<BR>
<P><BR>
Pointer DXGetArrayData(Array a)<BR>
</STRONG></TT><BR>
<P><STRONG>Functional Details</STRONG>
<P>
For irregular Arrays, the pointer points
to the actual data that was stored in the Array; this data may be
changed directly to change the contents of the Array.  For compact
Arrays (regular, grid, path, or mesh Arrays), this
routine expands the compact data and returns a pointer to the result;
such data should not be changed because
changes to this data will not be
reflected in the original Array.  The returned Array contains
<I>n</I>
items numbered from <I>0</I> to <I>n-1</I>,
where <I>n</I> is the
number of items in
<TT><STRONG>a</STRONG></TT>.
<TT><STRONG>
DXAddArrayData
</STRONG></TT>
must be called before calling
<TT><STRONG>
DXGetArrayData</STRONG></TT>; otherwise, the values of items in an
irregular Array are undefined.
<TABLE><TR><TD ALIGN="LEFT" VALIGN="TOP"><B>Note:</B></TD><TD ALIGN="LEFT"
VALIGN="TOP">
To reduce memory requirements, it is preferable, where possible, to
recognize compact Arrays using <TT><STRONG>DXGetArrayClass</STRONG></TT>,
and not to expand them by calling
<TT><STRONG>DXGetArrayData</STRONG></TT>.
The Array handle routines may be used to access arrays of any class
without expansion.
<P>
Memory pointed to by the return from <TT><STRONG>DXGetArrayData</STRONG></TT>
should <I>not</I> be freed by the user.
</td></tr></table>
<P><STRONG>Return Value</STRONG>
<P>
Returns a pointer to the data or returns <TT><STRONG>NULL</STRONG></TT>
and sets an error code.
<P><STRONG>See Also</STRONG>
<P>
<TT><STRONG>
<A HREF="progu100.htm#HDRDXAAD">DXAddArrayData</A>,
<A HREF="progu124.htm#HDRDXCAH">DXCreateArrayHandle</A>,
<A HREF="progu153.htm#HDRDXGAC">DXGetArrayClass</A>,
<A HREF="progu155.htm#HDRDXGADL">DXGetArrayDataLocal</A>,
<A HREF="progu245.htm#HDRDXNAV">DXNewArray, DXNewArrayV</A>
</STRONG></TT>
<P>
<A HREF="progu046.htm#HDRARRAYSC">12.3 , "Array Class"</A>.
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